JP2000055259A - Coupler for corrugate pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set the number of projections of corrugate pipes projected from a retainer without using a spacer, etc. SOLUTION: This coupler is furnished with a coupler main body 2 having a connecting hole 10 and a screw part 28, a nut 4 having a through hole 42 and a screw part 44 and a retainer 6 arranged in the connecting hole 10 of the coupler main body 2 free to be detached. In this case, the retainer 6 has a base part and a plural number of engagement click parts 34 provided with intervals in the peripheral direction, the base part 32 is installed on an inner peripheral surface of the connecting hole 10 of the coupler main body 2 free to be detached, and the nut 4 has a pressing part 46 to work on the base part of the retainer 6. When the nut 4 is fastened against the coupler main body 2, the pressing part 46 of the nut 4 works on the base part of the retainer 6, and consequently, the retainer 6 is detached from the coupler main body 2 and moves.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a joint for connecting a corrugated pipe.

[0002]

2. Description of the Related Art Corrugated pipes are widely used for passing gas, tap water and the like, and various types of joints have been proposed and put to practical use for connecting corrugated pipes. As an example of this corrugated pipe joint, for example, Japanese Patent No.
No. 86237 and Japanese Patent No. 2726380. Such a known joint includes a joint body, a nut screwed to the joint body, and a retainer rotatably engaged with the nut. A connection hole is formed in the joint body, a through hole is formed in the nut, and one end of the corrugated pipe to be connected is inserted into the connection hole of the joint body through the through hole of the nut. Further, the retainer has a plurality of engagement projections, and these engagement projections are expanded to climb over the peak of the corrugated pipe, and are reduced to engage with the valley of the corrugated pipe.

[0003] In this known joint, the corrugated pipe is connected by inserting the corrugated pipe through the through hole of the nut and then tightening the nut. That is, when the distal end of the corrugated pipe is inserted through the through hole of the nut, the plurality of engaging projections of the retainer engage with the valleys that follow about one peak of the distal end of the corrugated pipe. Then, when the nut is tightened in such a state, the retainer moves toward the shoulder of the joint body by the action of the nut, and the shoulder of the joint body and the retainer push about one peak of the corrugated pipe projecting from the retainer. One end of the corrugated tube is crushed and thus connected as required.

[0004]

In such a joint,
In order to crush about one mountain at the tip of the corrugated pipe, it is important to maintain the joint body and the nut in a predetermined positional relationship. More specifically, the tip of the corrugated pipe inserted through the through hole of the nut abuts the shoulder of the joint body, and the abutment of the shoulder prevents the insertion. Therefore, by setting the distance from the shoulder of the joint body to the engaging projection of the retainer to be approximately one peak of the corrugated pipe, it is ensured that about one peak of the distal end of the corrugated pipe is projected from the engaging projection of the retainer. This makes it possible to crush and connect about one peak of the distal end of the corrugated pipe.

In order to set the distance between the shoulder of the joint body and the engaging projection of the retainer in this way, for example, it is necessary to provide a spacer between the nut with which the retainer engages and the joint body. However, there is a problem that the configuration of the entire joint becomes complicated and the number of constituent parts increases.

It is an object of the present invention to provide a joint for a corrugated pipe which can set the number of peaks of a corrugated pipe protruding from a retainer without using a spacer or the like.

[0007]

SUMMARY OF THE INVENTION The present invention has a joint body having a connection hole and a screw portion extending in the axial direction, and a through hole extending in the axial direction and a screw portion screwing with the screw portion of the joint body. A corrugated pipe joint comprising a nut and a retainer removably disposed in the connection hole of the joint main body, wherein the retainer is circumferentially spaced between a base portion and one end of the base portion. And a plurality of engaging claws provided with the base member, wherein the base portion is detachably mounted on an inner peripheral surface of the connection hole of the joint body, and the plurality of engaging claws are expanded. The nut is provided so as to be openable and contractible, and the nut has a pressing portion that acts on the base portion or the plurality of engagement claws of the retainer, and the joint body is directed toward the nut. A shoulder which is provided adjacent to the shoulder, And a fitting inner surface into which the plurality of engaging claws of the retainer are fitted. When the corrugated pipe is inserted through the through hole of the nut, the plurality of engaging claws of the retainer are Expanding, climbing over the peak of the corrugated pipe, shrinking and engaging with the valley of the corrugated pipe, and tightening the nut, the pressing part of the nut causes the pressing part of the nut or the base or the plurality of Acting on the engagement claws, whereby the retainer is disengaged from the joint body, and as a result, moves in the axial direction relative to the joint body and fits into the fitting inner surface. Features.

According to the present invention, since the base of the retainer is mounted on the inner peripheral surface of the connection hole of the joint body, the distance from the shoulder of the joint body to the engaging claw of the retainer is kept constant. ing. Therefore, when the corrugated pipe is inserted through the through hole of the nut, a predetermined number of peaks of the corrugated pipe corresponding to the distance from the shoulder of the joint body to the engaging claw project from the engaging claw, regardless of the position of the nut, The number of peaks of the corrugated pipe projecting from the engaging claw portion of the retainer can be made constant. In addition, the retainer has a base portion and a plurality of engagement claws provided at one end of the base portion at a circumferential interval, and the base portion is attached to the joint body, so that the retainer is attached to the joint body. Can be easily mounted. In addition, the engaging claw portion of the retainer expands and climbs over the peak of the corrugated pipe, and contracts to engage with the valley of the corrugated pipe. Therefore, the valley at the tip of the corrugated pipe is engaged through this retainer. The pawl can be engaged. Furthermore, since the base part of the retainer is detachably attached to the joint body, by tightening the nut, the pressing part of the nut acts on the retainer (base part or engaging claw part), and the retainer separates from the joint body. Thereby, the retainer moves in the axial direction with respect to the joint body, and by the movement of the retainer,
The peak of the corrugated pipe projecting from the engaging claw is crushed. Further, since the retainer and the nut are separate bodies, relative rotation between the two is allowed, and therefore, when the ridge of the corrugated pipe is crushed, no excessive twisting force acts on the corrugated pipe.

Further, the present invention provides a joint body having a connection hole and a screw portion extending in an axial direction, a nut having a through hole extending in an axial direction and a screw portion to be screwed with the screw portion of the joint body, A corrugated pipe joint comprising a retainer disposed in the connection hole of the joint body,
The retainer has a base, and a plurality of engagement claws provided at one end of the base at intervals in a circumferential direction, and the base is formed in the connection hole of the joint body. The plurality of engaging claws are mounted on a peripheral surface, and the plurality of engaging claws are provided so as to be able to expand and contract. The nut is a pressing portion that acts on the base portion or the plurality of engaging claws of the retainer. The joint body has a shoulder facing the nut side, a fitting inner surface provided adjacent to the shoulder and into which the plurality of engaging claws of the retainer fit. When the corrugated pipe is inserted through the through-hole of the nut, the plurality of engaging claws of the retainer are expanded to climb over the corrugated pipe ridge, shrink and shrink. When engaging with the valley of the corrugated pipe and tightening the nut, the nut The pressing portion acts on the base portion or said plurality of engaging claw portions of said retainer, whereby a portion of the base portion of the retainer is cut,
As a result, the retainer moves relative to the joint body in the axial direction, and is fitted into the fitting inner surface.

According to the present invention, since the basic structure is substantially the same as that of the first aspect, substantially the same operation as described above is achieved. Further, since the retainer is configured so that a part of the base portion is cut, when the nut is tightened and the pressing portion acts on the retainer (the base portion or the engagement claw portion), the base portion is partially cut. Then, the retainer moves in the axial direction with respect to the joint body, and the movement of the retainer crushes the peak of the corrugated pipe projecting from the engagement claw.

[0011] The present invention is also characterized in that a concentric holding surface for holding the retainer concentrically with respect to the connection hole is provided on the inner peripheral surface of the connection hole of the joint body. Features.

According to the present invention, since the concentric holding surface is provided on the inner peripheral surface of the connection hole of the joint body, the retainer can be held concentrically with the connection hole. Therefore,
When the tip of the corrugated pipe is inserted through the retainer,
The engaging claw portion of the retainer acts concentrically on the valley portion of the inserted corrugated tube, and thus the ridge portion of the corrugated tube projecting from the engaging claw portion can be reliably crushed.

[0013] Further, according to the present invention, an engagement concave portion or an engagement protrusion is provided on the inner peripheral surface of the connection hole of the joint body.
The retainer is characterized in that the base portion is provided with an engagement protrusion or an engagement recess that engages with the engagement recess or the engagement protrusion.

According to the present invention, the engagement recess or the engagement projection is provided in the connection hole of the joint body, and the engagement projection or the engagement recess is provided in the base of the retainer. The base can be easily mounted in the connection hole of the joint body as required.

Further, according to the present invention, the distance from the plurality of engaging claws of the retainer to the shoulder of the joint body is set to a length of about one peak of the corrugated pipe to be inserted. It is characterized by being.

According to the present invention, since about one peak of the corrugated pipe projects from the engaging claw portion of the retainer, the number of crushed peaks is small, thereby shortening the axial length of the joint body. can do. Also, since the number of peaks of the corrugated pipe projecting from the engaging claw of the retainer is about one, when the corrugated pipe is inserted as required, the engaging claw of the retainer engages with the valley of the corrugated pipe. Therefore, the corrugated pipe cannot be pulled out even if the corrugated pipe is withdrawn. However, when the corrugated pipe is not inserted as required, the engaging claw of the retainer engages with the valley of the corrugated pipe. Therefore, if the corrugated tube is to be withdrawn, the corrugated tube can be easily pulled out, and thus a function of confirming the insertion of the corrugated tube can be provided.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a joint for a corrugated pipe according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a sectional view of the upper half of a first embodiment of a corrugated pipe according to the present invention, FIG. 2 is an exploded half sectional view of a corrugated pipe joint of FIG. 1, and FIG. It is a partial expanded sectional view which expands and shows the mounting part of a joint main body and a retainer in a joint for corrugated pipes.

The joint for a corrugated pipe shown in FIGS. 1 and 2 comprises a joint body 2, a nut 4 screwed to the joint body 2,
It comprises a retainer 6 attached to the joint body 2. The one end side (the left end side in FIGS. 1 and 2) of the joint body 2 is in the axial direction (the left-right direction in FIGS. 1 and 2).
A connection hole 10 extending in the axial direction is formed on the other end side (right end side in FIGS. 1 and 2), and the through hole 8 and the connection hole 10 communicate with each other. ing. In the joint main body 2, an annular shoulder portion 12 is provided at the back of the connection hole 10, and the shoulder portion 12 is provided on the nut 4 side, that is, toward the right side in FIGS. The shoulder 12 is provided with an annular recess 14. The annular recess 14 has a ring-shaped heat-resistant gasket 1.
The heat-resistant gasket 16 seals the space between the distal end of the corrugated pipe 18 and the joint body 2 as described later. Note that an annular protrusion 20 extending in the axial direction toward the nut 4 is integrally provided on the inner peripheral portion of the shoulder portion 12, and such an annular protrusion 20 is provided as understood from FIGS. Acting on the inner peripheral surface of one end of the corrugated pipe 18 to be inserted, it is held concentrically.

The connection hole 10 of the joint body 2 is provided with a fitting inner surface 22 adjacent to the shoulder portion 12. The inside diameter of the fitting inner surface 22 is gradually reduced in a tapered shape in the insertion direction of the corrugated pipe 18 (to the left in FIGS. 1 and 2). An annular concave portion 24 is provided adjacent to the right side of the fitting inner surface 22. Furthermore, this annular recess 24
An annular projection 26 is provided adjacent to the right side of. The annular projection 26 protrudes radially inward, and its inner surface (FIG. 1)
2 (left surface in FIG. 2) is tapered toward the nut 4 toward the inside in the radial direction and extends in a tapered manner. A female screw portion 28 is provided adjacent to the right side of the annular projection 26, and the female screw portion 28 is provided to the other end of the joint body 2. The outer peripheral surface of the intermediate portion of the joint body 2 is formed in a hexagonal shape, and a male screw portion 30 is provided on the outer peripheral surface of one end portion. Such a joint body 2 is formed of a metal material such as brass, for example.

The retainer 6 is connected to the connection hole 1 of the joint body 2.
It is mounted in advance within 0. Retainer 6 of this embodiment
Is, as shown in FIG.
And a plurality (six in the illustrated embodiment) of engagement pawls 34 provided at one end (the left end in FIGS. 1 and 2) of the annular base 32 at intervals in the circumferential direction. A slit extending in the axial direction is formed between the adjacent engaging claws 34. Each engagement claw portion 34 extends in the axial direction from one end of the base portion 32, and has a claw 36 protruding radially inward at a distal end portion thereof. Claw 36 of these engagement claw portions 34
Is smaller than the outer diameter of the peak 18a of the corrugated pipe 18 to be inserted, and the valley 18
It is set larger than the outer diameter of b. The engaging claw portion 34
Are separated by the slits, and can be expanded radially outward and contracted radially inward with their own elasticity, with the base, that is, the connection portion with the base portion 32 as a fulcrum.

Such a retainer 6 can be formed from a metal material such as brass, a synthetic resin material, or the like. The retainer 6 is a composite material using the engaging claw portion 34 as a metal material and the base portion 32 as a synthetic resin material. It can also be formed from a material.

The retainer 6 is mounted on the joint body 2 as shown in FIGS. Base part 3 of retainer 6
The other end of 2 is provided with an annular engaging projection 38 projecting outward in the radial direction. The retainer 6 is connected to the joint body 2.
By inserting the engagement projection 38 of the base portion 32 into the annular projection 26 by inserting the connection projection 10 into the connection hole 10, it is detachably attached to the joint body 2. In the mounted state of the retainer 6, as shown in FIG.
6 is located opposite to the annular concave portion 24 of the joint body 2, the movement of these claws 36 outward in the radial direction is allowed,
The engagement claw 34 can be expanded. Since the inner surface of the annular projection 26 of the joint main body 2 is formed in a tapered shape, the abutment of the claw 36 on the inner peripheral surface of the connection hole 10 is avoided, and the engagement claw portion 34 is further expanded. Is acceptable. In this embodiment, the joint body 2 is provided with the annular recess 24 to allow the engaging claw 34 of the retainer 6 to expand.
4, the inner diameter of the connection hole 10 of the joint body 2 may be increased over the entire length.

In this embodiment, the distal end surface 40 of the annular projection 26 is formed in a short cylindrical shape. With this configuration, the outer peripheral surface of the base portion 32 of the retainer 6 is mounted on the peripheral surface of the distal end surface 40, and both peripheral surfaces come into contact with each other over a predetermined range in the axial direction. 10
The distal end surface 40 functions as a concentric holding surface for holding the retainer 6 concentrically.

The retainer 6 has a small pressing force (for example, a force acting when the nut 4 is manually tightened, and a corrugated pipe) since the annular engaging projection 38 abuts on the annular projection 26 of the joint body 2. Although it does not separate from the joint body 2 even if a force acting when the nut 18 is inserted acts on the joint body 2, a large pressing force (for example, a force acting when the nut 4 is tightened with a tightening tool) is used. When a force is applied, the annular engaging projection 38 is elastically deformed (or plastically deformed) and climbs over the annular projection 26 of the joint body 2, and is separated from the joint body 2 by climbing over. When the engaging projection 38 gets over the annular projection 26 of the joint body 2 with a small pressing force, the base 32 of the retainer 6 is prevented from being detached with a small pressing force by, for example, an adhesive or press-fitting. Can be fixed. On the other hand, in the case where the engagement projection 38 can easily cross over the annular projection 26, for example, the engagement projection 38 can be provided with a tapered surface inclined inward in the radial direction toward the insertion direction.

Referring again to FIGS. 1 and 2, the nut 4 is formed with a through hole 42 extending therethrough in the axial direction (the left and right direction in FIGS. 1 and 2). The corrugated pipe 18 is inserted into the connection hole 10 of the joint body 2 through the through hole 42. An external thread 44 is provided on the outer peripheral surface near one end of the nut 4. The male thread 44 of the nut 4 is screwed into the female thread 28 of the joint body 2, and the joint body 2 and the nut 4 are mutually screwed. At one end of the nut 4, a pressing portion 46 extending toward the joint body 2 in the axial direction is provided. This pressing portion 46
Are provided in an annular shape in this embodiment, but a plurality of may be provided at intervals in the circumferential direction. The pressing portion 46 is provided corresponding to the base portion 32 of the retainer 6, and acts on the end face of the base portion 32 of the retainer 6 when the nut 4 is tightened as described later.

The outer peripheral surface of the other end of the nut 4 is formed in a hexagonal shape, and an annular concave portion is formed on the inner surface side of the hexagonal end portion of the nut 4. A member 48 is mounted. The permselective seal member 48 is made of, for example, porous polyethylene and prevents water or the like from entering the inside of the joint from the outside. When the gas leaks from between the pipes 18, the gas is allowed to pass through the seal member 48 and leak to the outside. The latter leak occurs when a hole is made in a part of the corrugated pipe 18 or the like. Applying soapy water,
It is possible to confirm the soundness of the piping system by confirming that there is no leak from the leak portion to the outside by a leak detecting means such as a gas detector. Further, an annular concave portion 50 is formed on the inner peripheral surface of the other end portion of the nut 4.
An annular seal 52 having a substantially T-shaped cross section is mounted. The annular seal 52 seals between the protection tube 54 covering the corrugated pipe 18 and the nut 4.

The retainer 6 can be mounted, for example, as shown in FIGS. 4 to 7, instead of being mounted on the joint body 2 as shown in FIGS. In the mounting structure of FIG. 4, an engagement recess 62 is provided at one end of the distal end surface of the annular projection 26A of the joint body 2, and the retainer 6 is substantially the same as the configuration shown in FIGS. In this mounting structure, the retainer 6 is detachably mounted so that the annular engaging projection 38 is engaged with the concave portion 62 of the annular projection 26A. In this mounting state, the entire inner peripheral surface of the engaging recess 62 of the annular projection 26A contacts the entire outer peripheral surface of the engaging projection 38 of the retainer 6, so that the inner peripheral surface of the engaging concave 62 It acts as a concentric holding surface for holding concentrically.

The mounting structure shown in FIG. 5 is substantially the same as the structure shown in FIGS. 1 to 3 except that the engaging projection of the retainer 6 is omitted. In this mounting structure, the base 32 of the retainer 6A is removably mounted on the distal end surface 40 of the annular projection 26 of the joint body 2 by an adhesive or press-fitting. In this mounting state, as in the embodiment shown in FIGS. 1 to 3, the entire peripheral surface of the distal end surface 40 of the annular projection 26 contacts the outer peripheral surface of the base portion 32 of the retainer 6 </ b> A. Acts as a concentric holding surface for holding the retainer 6A concentrically.

In the mounting structure shown in FIG.
An annular engaging concave portion 66 is provided at an intermediate portion in the axial direction of the distal end surface, and the retainer 6 is substantially the same as the configuration shown in FIGS. In this mounting structure, the engagement recess 6 of the annular projection 26B is formed.
The retainer 6 is detachably mounted so that the annular engaging projection 38 of the retainer 6 engages with the retainer 6. In this mounting state, the entire inner surface (bottom surface and side surface) of the engagement recess 66 of the annular projection 26B contacts the outer surface of the engagement protrusion 38 of the retainer 6, so that the inner surface of the engagement recess 66 is concentric with the retainer 6. Acts as a concentric holding surface for holding in a shape.

In the mounting structure shown in FIG. 7, the annular projection 26 of the joint body 2 is omitted, and an annular engaging recess 68 is provided on the inner peripheral surface of the connection hole 10 of the joint body 2. In this case, it is necessary to make the inner diameter of the connection hole 10 large enough to allow the engaging claw portion 34 to expand beyond the corrugated tube peak. The retainer 6B has substantially the same configuration as that shown in FIGS. 1 to 3, but has an engagement protrusion 38 that protrudes largely outward in the radial direction. In this mounting structure, the retainer 6B is detachably mounted so that the engaging projection 38 of the retainer 6B engages with the engaging recess 68 of the joint body 2. In this mounting state, the entire inner surface of the engaging recess 68 comes into contact with the outer surface of the engaging projection 38 of the retainer 6B, so that the inner surface of the engaging recess 68 has a concentric holding surface for holding the retainer 6 concentrically. Act as

As described above, the retainer 6 (6A, 6B) can be connected to the joint body 2 by using the mounting structure shown in FIGS.
Can be detachably mounted on the joint body 2 and can be held concentrically with respect to the connection hole 10 of the joint body 2. When the retainer 6 (6A, 6B) exerts a small pressing force (for example, a force acting when the nut 4 is manually tightened or a force acting when the corrugated pipe 18 is inserted), the joint 6 Although it does not separate from the main body 2, it separates from the joint main body 2 when a large pressing force (for example, a force acting when the nut 4 is tightened by using a tightening tool) acts on the joint main body 2. Move relatively. In the mounting structure shown in FIGS. 4, 6, and 7, the engaging projections 38 of the retainer 6 (6B) are provided in an annular shape. However, it is not always necessary to provide the engaging projections 38 in an annular shape. A plurality can be provided.

Referring mainly to FIGS. 1 and 8, a method of connecting the corrugated pipe 18 will be described. As shown in FIG. 1, the corrugated pipe 18 is formed in a wavy shape,
And the valleys 18b are provided alternately, and are covered by a synthetic resin protective tube 54 over the entire length thereof. When connecting the corrugated pipe 18, first, as shown in FIG. 1, a part of the protective tube 54 covering one end of the corrugated pipe 18 is removed, and several peaks, for example, 4 to 6 from one end of the corrugated pipe 18. Expose the mountains. Further, the joint body 2 and the nut 4 are screwed in advance. In this embodiment, since the retainer 6 is mounted on the joint main body 2, it is not necessary to hold the nut 4 and the joint main body 2 in a predetermined positional relationship, it is sufficient to simply screw them together, and both are held in a predetermined position. There is no need for a spacer to perform the operation.

Next, in the state where the joint body 2 and the nut 4 are screwed together, one end of the corrugated pipe 18 (the end from which the protective tube 54 has been removed) is inserted through the through hole 42 of the nut 4 to the left in FIG. . When inserted in this manner, the ridges 18a of the corrugated fitting 18 are engaged with the engagement claws 34 of the retainer 6.
When the claw 36 of the engaging claw 34 passes through the claw 36 of the engaging claw 34, the engaging claw 34 expands and climbs over the crest 18a. Part 3
4 contracts and engages with the valley 18b.

In this embodiment, as shown in FIG. 1, the distance from the shoulder portion 12 of the joint main body 2 to the claw 36 of the engagement claw portion 34 of the retainer 6 is set to be approximately one mountain of the corrugated pipe 18. ing. Therefore, when the corrugated pipe 18 is inserted as described above, the first crest 18a from the tip of the corrugated pipe 18 passes through the claw 36 of the retainer 6, but the second crest 18a from the tip is corrugated. Since the distal end of the pipe 18 abuts on the shoulder 12 of the joint body 2, it cannot pass through the pawl 36, and the pawl 36 of the engaging pawl 34 of the retainer 6
It engages with the valley 18b next to the first peak 18a from the tip. In this way, by configuring the engaging claw portion 34 to engage with the valley portion 18b next to the first peak portion 18a from the tip of the corrugated pipe 18, the insertion confirmation function can be provided. That is, when the corrugated pipe 18 is inserted as required, the engaging claws 34 of the retainer 6 are engaged with the valleys 18 b of the corrugated pipe 18, and thus the corrugated pipe 18 is pulled out even if it is to be pulled out. Can not do. On the other hand, when the corrugated pipe 18 is not inserted as required, the engaging claws 34 of the retainer 6 are not engaged with the valleys 18b of the corrugated pipe 18, so that if the corrugated pipe 18 is to be pulled out, Can be easily pulled out. Thus, the insertion of the corrugated pipe 18 can be confirmed based on whether or not the corrugated pipe 18 can be pulled out. Further, by projecting one ridge of the corrugated pipe 18 from the engaging claw portion 34 of the retainer 6 in this manner, the number of crushed ridges of the corrugated pipe 18 is reduced, and the axial length of the entire joint is reduced. be able to. In this embodiment, the shoulder 1 of the joint body 2 is used.
Although the distance from 2 to the claw 36 of the engagement claw portion 34 of the retainer 6 is set to a length of about one peak of the corrugated pipe 18,
This distance is set for a plurality of peaks of the corrugated pipe 18, for example, 2 to 5
It can also be set to the length of a mountain, and the number of such mountains corresponds to the number of mountains to be crushed.

Thereafter, the nut 4 is tightened using a tightening tool (not shown). When the nut 4 is tightened by using a tightening tool, the pressing portion 46 of the nut 4 comes into contact with the base portion 32 of the retainer 32, and a further pressing force acts upon further tightening of the nut 4, so that the retainer 6 moves from the joint body 2. break away. When the nut 4 is further tightened, the pressing portion 46 of the nut 4 moves the retainer 6 engaged with the valley portion 18 b of the corrugated pipe 18 toward the shoulder portion 12 of the joint main body 2, and engages the retainer 6. The outer periphery of the leading end of the dowel 36 is fitted into the fitting inner surface 22 of the joint body 2, and by such fitting, the expansion of the engaging claw 34 of the retainer 6 is reliably prevented. Of the corrugated pipe 18
Of the corrugated pipe 18 protruding from the retainer 6 so that the peak 18a of the corrugated pipe 18 can be reliably moved toward the shoulder 12 of the joint body 2. As can be easily understood, the inner diameter of the fitting inner surface 22 of the joint body 2 is gradually reduced in the axial direction in a tapered shape, but the inner diameter may be the same in the axial direction.

When the nut 4 is tightened as required in this manner, as shown in FIG.
Of the corrugated pipe 18 protruding from the shoulder portion 12 and the retainer 6 are crushed by being sandwiched between the shoulder portion 12 and the retainer 6, and the tip of the crushed ridge portion 18 a is pressed against the heat-resistant gasket 16 of the shoulder portion 12 of the joint body 2. Then, the space between the distal end portion of the corrugated pipe 18 and the joint body 2 is reliably sealed by the heat-resistant gasket 16.

As described above, in a state where the joint body 2 and the nut 4 are screwed together, one end of the corrugated pipe 18 is inserted through the through hole 42 of the nut 4, and then the nut 4 is tightened using a tightening tool. The connection of the corrugated pipe 18 can be performed by a simple operation of tightening.

Although the embodiments of the joint for corrugated pipes according to the present invention have been described above, the present invention is not limited to such embodiments, and various changes and modifications can be made without departing from the scope of the present invention. is there.

For example, in the illustrated embodiment, the joint body 2
The annular projection 26 has an engagement recess 62 (66), and the engagement projection 38 is provided on the base 32 of the retainer 6 correspondingly.
2 can be provided with an engagement recess, and an engagement projection can be provided on the annular projection 26 of the joint body 2 corresponding to the engagement recess.

Further, in the illustrated embodiment, the base portion 32 of the retainer 6 is formed in a continuous annular shape. However, the present invention is not limited to this, and the retainer 6 may be formed in a substantially C-shape with a part cut away. In such a configuration, the base itself can be expanded and contracted.

In the illustrated embodiment, the retainer 6 mounted on the joint body 2 is detached. Alternatively, when a large pressing force is applied to the retainer 6, a part of the base 32, For example, the base of the engaging projection 38 may be cut off. Even with such a configuration, the retainer 6 is separated from the joint main body 2 and is fitted into the fitting inner surface 22 of the joint main body 2, and the same effect as described above is achieved.

Further, in the illustrated embodiment, the pressing portion 46 of the nut 4 acts on the base portion 32 of the retainer 6, but instead, as shown in FIG. It can be configured to act on the claw of the engaging claw of the retainer. FIG. 9 showing a second embodiment of the joint
With reference to FIG. 5, an annular pressing portion 46A provided at one end of the nut 4 extends in the axial direction after being slightly inclined inward in the radial direction. When the nut 4 is tightened, the pressing portion 46A, as shown in FIG.
2 of the plurality of engaging claws 34 passing through the inner side in the radial direction
6, which act on the inner surface (the right surface in FIG.
Is pressed directly. Other configurations of the joint body 2, the retainer 6, and the nut 4 in FIG. 9 are substantially the same as the configurations shown in FIGS.

When the base portion 32 of the retainer 6 is pressed by the pressing portion of the nut 4, if the strength of the base portion 32 is weak (for example, its thickness is thin), the base portion 32 is deformed and the force from the nut 4 is applied. Is not sufficiently transmitted to the engaging claw portion 34 and the peak portion 18a of the corrugated tube 18. In contrast,
When the claw 36 of the retainer 6 is directly pressed by the pressing portion 46A of the nut 4, even if the thickness of the base portion 32 is thin, the force from the nut 4 can be applied to the engaging claw portion 34 via the pressing portion 46A.
Of the corrugated pipe 18 protruding from the engaging claw portion 34 can be reliably crushed.

[0044]

According to the joint for a corrugated pipe of the first aspect of the present invention, when the corrugated pipe is inserted through the through hole of the nut, the predetermined length of the corrugated pipe corresponding to the distance from the shoulder of the joint body to the engaging claw is provided. The number of peaks protrudes from the engaging claw, and the number of corrugated pipes protruding from the engaging claw of the retainer is kept constant regardless of the position of the nut and without using a spacer ring between the joint body and the nut. can do. Further, the retainer can be easily mounted on the joint body. Further, by tightening the nut, the pressing portion of the nut acts on the retainer and separates from the joint body,
As a result, the retainer moves in the axial direction with respect to the joint body, and the movement of the retainer can crush the corrugated pipe protruding from the engagement claw as desired.

According to the joint for a corrugated pipe of the second aspect of the present invention, since the basic structure is the same as that of the first aspect, the same effect as described above is achieved. Further, when the nut is tightened, a part of the base portion of the retainer is cut, and the retainer moves in the axial direction with respect to the joint main body. By the movement of the retainer, the corrugated pipe protruding from the engagement claw portion is removed. Can be crushed as required.

Further, according to the joint for a corrugated pipe of the third aspect of the present invention, the retainer can be held concentrically with respect to the connection hole, whereby the corrugated pipe protruding from the engaging claw portion of the retainer can be held. The mountain can be reliably crushed.

According to the joint for a corrugated pipe of the fourth aspect of the present invention, the base portion of the retainer can be easily attached to the connection hole of the joint body as required.

Further, according to the joint for a corrugated pipe of the fifth aspect of the present invention, the number of peaks to be crushed is small, whereby the axial length of the joint main body can be shortened. Further, a function of confirming the insertion of the corrugated pipe can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an upper half of a first embodiment of a corrugated pipe according to the present invention.

FIG. 2 is an exploded half sectional view of the corrugated pipe joint of FIG. 1;

FIG. 3 is a partially enlarged cross-sectional view showing, on an enlarged scale, a mounting portion of a joint main body and a retainer in the corrugated pipe joint of FIG. 1;

FIG. 4 is a partially enlarged sectional view showing a first modification of the mounting structure of the retainer.

FIG. 5 is a partially enlarged sectional view showing a second modification of the mounting structure of the retainer.

FIG. 6 is a partially enlarged sectional view showing a third modification of the mounting structure of the retainer.

FIG. 7 is a partially enlarged sectional view showing a fourth modification of the mounting structure of the retainer.

8 is a cross-sectional view showing an upper half of the joint for a corrugated pipe of FIG. 1 when a corrugated pipe is connected.

FIG. 9 is a sectional view showing an upper half of a second embodiment of a corrugated pipe according to the present invention.

[Explanation of symbols]

 2 Joint Main Body 4 Nut 6, 6A, 6B Retainer 10 Connection Hole 12 Shoulder 18 Corrugated Tube 18a Crest 18b Valley 22 Fitting Inner Surface 24 Annular Recess 26 Annular Projection 28 Female Thread 32 Base 34 Engagement Claw 36 Claw 38 Engagement projection 42 Through hole 44 Male thread 46, 46A Pressing part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinsuke Takahashi 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi Inside Osaka Gas Co., Ltd. (72) Inventor Takeshi Hashimoto 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi Osaka Gas Co., Ltd. F-term (reference) 3H017 CA05

Claims (5)

[Claims] 1. A joint body having a connection hole and a screw portion extending in an axial direction, a nut having a through hole extending in an axial direction and a screw portion screwed to the screw portion of the joint body,
A joint for a corrugated pipe, comprising: a retainer removably disposed in the connection hole of the joint main body, wherein the retainer is spaced apart from a base portion at one end of the base portion in a circumferential direction. A plurality of engaging claws provided, wherein the base is detachably mounted on an inner peripheral surface of the connection hole of the joint body, and the plurality of engaging claws are expanded and contracted. The nut has a pressing portion that acts on the base portion or the plurality of engaging claws of the retainer, and the joint body has a shoulder facing the nut. And a fitting inner surface that is provided adjacent to the shoulder portion and into which the plurality of engaging claws of the retainer fit. When the corrugated pipe is inserted through the through hole of the nut, The plurality of engaging claws of the retainer are expanded and When the nuts are tightened by climbing over the peaks of the corrugated pipe, engaging with the valleys of the corrugated pipes, and tightening the nut, the pressing portion of the nut engages the base or the plurality of engagements of the retainer. Acting on a claw portion, whereby the retainer is disengaged from the joint body, so that the retainer moves axially relative to the joint body and fits into the fitting inner surface. Pipe fittings. 2. A joint body having a connection hole and a screw portion extending in an axial direction, a nut having a through hole extending in an axial direction and a screw portion screwed to the screw portion of the joint body,
A joint for a corrugated pipe, comprising: a retainer disposed in the connection hole of the joint main body; wherein the retainer is provided at a circumferential direction at a base portion and at one end of the base portion. A plurality of engaging claws, wherein the base is mounted on an inner peripheral surface of the connection hole of the joint body, and the plurality of engaging claws are provided so as to be able to expand and contract. The nut has a pressing portion that acts on the base portion or the plurality of engaging claws of the retainer. The joint body has a shoulder portion facing the nut side and a shoulder portion. And a fitting inner surface into which the plurality of engaging claws of the retainer are fitted. The corrugated pipe is inserted through the through hole of the nut, and the plurality of retainers are provided. The engaging claw portions are expanded to open the corrugated pipe. When it climbs over the ridge, contracts and engages the valley of the corrugated pipe, and tightens the nut, the pressing portion of the nut acts on the base portion or the plurality of engaging claws of the retainer. Thereby, a part of the base portion of the retainer is cut, and as a result, the retainer moves relatively in the axial direction with respect to the joint body and fits into the fitting inner surface. Fitting for corrugated pipe. 3. A concentric holding surface for holding the retainer concentrically with respect to the connection hole is provided on the inner peripheral surface of the connection hole of the joint body. Item 3. A joint for a corrugated pipe according to item 1 or 2. 4. An engagement recess or an engagement protrusion is provided on the inner peripheral surface of the connection hole of the joint body, and the base of the retainer is provided with an engagement recess or an engagement protrusion. The joint for a corrugated pipe according to any one of claims 1 to 3, wherein an engaging projection or an engaging concave portion to be engaged is provided. 5. A distance from the plurality of engaging claws of the retainer to the shoulder of the joint body is set to a length of about one peak of a corrugated pipe to be inserted. The joint for a corrugated pipe according to any one of claims 1 to 4, wherein